A little correction here - actually the Eiffel Tower was not intended just for radio broadcasting, that came later. It became more of a scientific laboratory for experiments, Eiffel himself conducted aerodynamic tests there. The military used it for communication during wartime which really cemented its stay.

Actually, I've been researching this topic quite extensively, the Lost Media Wiki has some information on the 'Forgotten Universe' series but nothing substantial about the lost footage. There were indeed some reports about the footage being controversial, causing it to be removed, and the BBC supposedly planning to release an …